Saturday

December 3, 2016
Total # Posts: 5,037

**physics**

A climber stands on a ledge on one side of a valley. He claps his hands and hears an echo from the opposite side of the valley 1.6 s later. How wide is the valley?

*April 30, 2014*

**trig**

On a typical day at an ocean port, the water has a maximum depth of 18m at 6:00 am. The minimum depth of 9m occurs 6.8 hours later. Write an equation to describe the relationship between the depth and time.

*April 29, 2014*

**algebra**

x5−8x4+28x3−56x2+64x−32=0

*April 27, 2014*

**Math**

A six sided die is tossed. What is the probability that it shows a prime number if you know the following? a. It shows an even number. b. It shows a number less than 5. c. It does not show a 6. d. It shows 1 or 2/ e. It shows an even number less than 4. f. It shows a number ...

*April 24, 2014*

**Physics**

Please explain to me how to do this question!!!!!!! A beam consists of singly ionised neon-20 atoms all travelling at the same speed, 3*10^5 m/s, through a vacuum. As the beam passes through the magnetic field it follows a circular path of radius 0.125m. The force on each of ...

*April 24, 2014*

**physics**

The planet Jupiter has a satellite, Io, which travels in an orbit of radius 4.220×108 m with a period of 1.77 days. Calculate the mass of Jupiter from this information.

*April 23, 2014*

**math**

Reggie knows the length and width of a rectangle. How can he find the perimeter of the rectangle

*April 22, 2014*

**Chemistry-need help ASAP**

again don't know where to start, really just want a step by step so I can do the rest of my homework

*April 14, 2014*

**Chemistry-need help ASAP**

15 ml of 3.0 M NaOH are added to the following: 500.0 ml of pure water 500.0 ml of 0.1 M formic acid 500.0 ml of 0.1 M formate of potassium 500.0 ml of a solution containing 0.1 M formic acid and 0.1 M formate of potassium. Calculate the difference of pH resulting from the ...

*April 14, 2014*

**Chemistry**

i don't even know where to start, I'm really confused on this topic in chemistry, I just want to see at step by step way to solvethis problem.

*April 14, 2014*

**Chemistry **

Titration of 50.0 ml of acetic acid reaches equivalence after delivery of 22.5 ml of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH after addition of 20.0 ml of NaOH? ...

*April 14, 2014*

**physics**

A staging that weighs 210 N supports two painters, one 310 N and the other 440 N. The reading in the left scale is Fℓ = 320 N. What is the reading Fr in the right hand scale? Answer in units of N

*April 10, 2014*

**English III**

Could you post the answers you got after turning in the assignment

*April 10, 2014*

**physics**

these are the choices for the answer: Consider the rotational motion of two compact discs (CD). Disc A undergoes a rotation of 540 degrees in 1.50 secs, and disc B undergoes a rotation of π radians in 3.00 secs. a) Angular speed (A) = 4π radians/sec Angular speed (B...

*April 7, 2014*

** reading**

what general statement you make about Babe Didrikson and women athletes?

*April 1, 2014*

**physics113**

Heat can be defined as in phy113

*March 26, 2014*

**phy113**

What mass of ice is needed to cool 60g of water from 43oC to 20oC

*March 26, 2014*

**phy113**

An ungraduated mercury thermometer attached to a millimeter scale reads 22.8 mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is. 20oC?

*March 26, 2014*

**chemistry**

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.50 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.43 °C. ...

*March 25, 2014*

**math**

CALCULATE if 1/3of the candles are pink 3/8 are yellow and 1/4 is blue remaining 2 are white

*March 24, 2014*

**Physics**

A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?

*March 23, 2014*

**Physics**

Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 540 V? (b) What is the voltage between...

*March 23, 2014*

**Science**updated asnwers****

Ms.Sue I know I am not part of this but I hope you know that there are a lot of kids on this site and I don't think you should be saying you have been using drugs. This is not a good influence on younger kids.

*March 21, 2014*

**PHysiscs**

Four acrobats of mass 83.5 kg, 68.0 kg, 62.0 kg, and 55.0 kg form a human tower, with each acrobat standing on the shoulders of another acrobat. The 83.5-kg acrobat is at the bottom of the tower. (a) What is the normal force acting on the 83.5-kg acrobat?

*March 18, 2014*

**Physics **

A truck with 0.100 m radius tires travels at 24.0 m/s. At how many radians per second are the tires rotating? What is this in rpm?

*March 17, 2014*

**Physics **

An automobile with 0.310 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?

*March 17, 2014*

**Physics **

In lacrosse, a ball is thrown from a net on the end of a stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.0 rad/s and the ball is 1.05 m from the elbow joint, what is the velocity of the ball?

*March 17, 2014*

**Physics **

A basketball player is running at 5.00 m/s directly toward the basket when he jumps into the air to dunk the ball. He maintains his horizontal velocity. (a) What vertical velocity does he need to rise 0.750 meters above the floor? (b) How far from the basket (measured in the ...

*March 17, 2014*

**Physics **

An archer shoots an arrow at a 78.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 34.0 m/s? (Although neglected here, the ...

*March 17, 2014*

**math**

S0rry i meant to say idid this befofe i asked for help. It didn't seem right to me but now the way you did it , i get it

*March 17, 2014*

**math**

THANK YOU . Idid 2000 * 29 / 100 =580

*March 17, 2014*

**math **

In a recent poll of 2000 households, 29% had pets. How many households did not have pets?

*March 17, 2014*

**math**

Thanks i got the same answer in a different way

*March 17, 2014*

**math **

Fabric costs14.00 per yard. If you buy 5 yards or more ,you can get 20% off. how much would 5 yards cost on sale?

*March 17, 2014*

**Spelling**

iam helping my 4th graders with spelling/reading

*March 17, 2014*

**math **

how do you do 33 1/3% of 200.oo? the 1/3 is throwing me off. Thank you

*March 17, 2014*

**math**

got it . Thank you

*March 15, 2014*

**math **

Pete saved 24.00 of the 60 .oo dollars he earned. What percentage of his earnings did he save ?

*March 15, 2014*

**math**

Thanks everyone for the help

*March 15, 2014*

**math **

John bought 3 of the same shirt and paid 63.00 after the 30% discount.What was the original price of one of the shirts ? Not sure at all how to do this. Thank you

*March 15, 2014*

**math**

how to use a common denominator to write an equivalent fraction for each fraction?

*March 13, 2014*

**math**

I need help on how to use a common denominator to write an equivalent fraction for each fraction?number 1 is 1/2,1/3 and number 2 is 7/8,3/10 please help

*March 13, 2014*

**8th Grade Science (Periodic Table)**

thanks MO

*March 13, 2014*

**chem**

what are the type of chemical reactions for the below (synthesis, double/single displacement or decomposition) 2Na+2H2O->2NaOH+H2 2FeS2+3O2->Fe2O2+2SO2 CaCO3->CO2+CaO 2H2S+2KOH->K2S+2HOH 2Ca+4HOH->2Ca(OH)2+H2

*March 12, 2014*

**please check(Social studies)**

5 is D in case anyone is interested

*March 12, 2014*

**chemistry**

what is the chemical reactions for these... 2Na+2H2O->2NaOH+H2 2FeS2+3O2->Fe2O2+2SO2 CaCO3->CO2+CaO

*March 12, 2014*

**Chemistry**

how do i name this chemical? S(ClO3)2

*March 12, 2014*

**Chemistry**

how do i name this chemical? Fe(NO3)2

*March 12, 2014*

**chemistry**

i don't know how to write it into a chemical formula

*March 11, 2014*

**chemistry**

i need help with writing nomenclature for the formula and the compounds examples: Sodium bisulphate hydroiodic acid ammonium dihydrogen phosphate Zn(HCrO4)2 Calcium metal ferrous bromide sodium carbide phosphate radical liquid mercury plumbic oxide auric carbonite sodium ...

*March 11, 2014*

**Algebra**

just curious what grade is this math

*March 11, 2014*

**Chemistry check and help**

what is ... Sodium bisulphate hydroiodic acid ammonium dihydrogen phosphate Zn(HCrO4)2 Calcium metal ferrous bromide sodium carbide phosphate radical Check... sodium bicarbonate NaHCO3

*March 11, 2014*

**math studies**

A rhombus has diagonals of lenth 12 cm and 7 cm respectively. Find the larger angle of the rhombus

*March 11, 2014*

**math 3**

4 layers

*March 3, 2014*

**Chemistry**

I am learning the different types of chemical reactions synthesis, decomposition, single displacement, and double displacement I am also learning skeletal equations word equations and balancing the equations I know how to balance equations if I am given the formula in symbols ...

*March 3, 2014*

**cHEMISTRY**

i don't know how to write chemical formulas is it like nomenclature because i need to balance equations (which i know how if the equation is given to me the symbols type but not in words), i need to write skeletal equations but i don't know if they are correct. example...

*March 2, 2014*

**Social Studies--Check My Answers Please--**

shia is 100

*February 28, 2014*

**Social Studies**

anonymous is 100%

*February 28, 2014*

**Calculus**

q = f(p) = 10300e^−0.34p a) Find the number of products sold when the price of the product is $5. (Round your answer to the nearest whole number.) Number of products sold: b) Find a formula for the rate of change in the number of products sold when the price is p dollars...

*February 27, 2014*

**Physics**

A horse pulls a cart with a force of 180.0 N at and angle of 33.0° with respect to the horizontal and moves along at a speed of 11.0 km/hr. How much work does the horse do in 8.6 min? What is the average power of the horse?

*February 26, 2014*

**SCIENCE**

do mass containe capcity

*February 26, 2014*

**physics**

A force of 1.24 N pushes against an object with a mass of 0.16 kg for 4.00 min. The object does not move. What is the work done on the object by the force?

*February 25, 2014*

**Science**

I think it's A but I'm not sure

*February 24, 2014*

**math**

thank you

*February 22, 2014*

**math**

sorry i still don't understand .What do i cross multiply?

*February 22, 2014*

**math **

A store finds out that 5 out of every 9 customers prefer new extra crunch peanut butter. If the store sells 90,000 jars or regular peanut butter, how many jars of new x crunch should it produce ,and how many of regular should it produce ? Have no idea how to do this. please help

*February 22, 2014*

**physics**

A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping?

*February 21, 2014*

**chemistry**

How much heat is released when 28.95g of water is frozen?

*February 21, 2014*

**math**

A colony of bacteria is growing in a petri dish which has a maximum capacity of 100mg. The mass of bacteria is increasing at a rate given by the logistic equation. Initially there is 2mg of bacteria and the rate of increase is 1mg per day.

*February 21, 2014*

**Statistics**

Its x~Bin(32,.98) since were looking for when it WILL operate and x = 32.

*February 20, 2014*

**Math**

Mandy scores b points in a basketball game. Jay scores 3 points less than Mandy. Kareem scores 2 times as many points as Mandy. Find the number of points that Jay scores in terms of b.

*February 20, 2014*

**Chemistry**

how do i figure out the valences for elements in the transition elements section in the periodic table of elements (i need it for doing nomenclature) and how do i figure out the valences if i don't have the periodic table of elements examples: Zn Cu Ni Co Fe Mn Cr V Ti Sc

*February 20, 2014*

**Social Studies--Check My Answers Please--**

100% thanks Diana!

*February 20, 2014*

**statistics**

Suppose that each unit of a system is up with probability 2/3 and down with probability 1/3. Different units are independent. For each one of the systems shown below, calculate the probability that the whole system is up (that is, that there exists a path from the left end to ...

*February 17, 2014*

**Math**

Perimeter of rectangle = 2*l+b. Area = l*b. If l = 1m, b = 55cm. Find area and perimeter

*February 17, 2014*

**Chemistry check and help**

so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements? ex. P02 the P for Phosphorus doesn't have a number does it mean it is a one then ex.SO3 ...

*February 16, 2014*

**Chemistry**

so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements? ex. P02 the P for Phosphorus doesn't have a number does it mean it is a one then ex.SO3 ...

*February 16, 2014*

**Chemistry**

i need to write to chemical formula for sulphur(II)iodide but both are non metals what do i do and i get confused sometimes cause i don't know when the metal/non metal gets a one charge (for the valences) ex. NiO =Ni1O2 =Ni2O =Nickel(I)Oxide ex. NiF2 =Ni1F2 =Ni2F =Nickel(...

*February 16, 2014*

**math**

Thank you for working with me on math problems

*February 16, 2014*

**math**

So would it be 100 x 8 / 16 =50 lbs ?

*February 16, 2014*

**math **

How many pounds of nails will be needed to fill 100 boxes with 8oz. of nails in each?

*February 16, 2014*

**S.S Check my answers**

1. What is an environmental issues facing the US and Canada? How have the countries worked together to help solve the problem. Can someone please help me :(

*February 14, 2014*

**Chemistry**

I am supposed to name this using IUPAC method for binary compounds (i think) arsenic(111) sulfide silicon tetraiodide antimony (111)bromide ammonia gas lead(11) and the things in the brackets are supposed to be the roman numerals

*February 13, 2014*

**physics**

After falling from rest at a height of 31.5 m, a 0.564 kg ball rebounds upward, reaching a height of 20.2 m. If the contact between ball and ground lasted 1.80 ms, what average force was exerted on the ball?

*February 12, 2014*

**physics**

The initial velocity of a 1.55 kg block sliding down a frictionless inclined plane is found to be 1.27 m/s. Then 1.07 s later, it has a velocity of 5.37 m/s. What is the angle of the plane with respect to the horizontal?

*February 12, 2014*

**Random**

Why is society unfair?

*February 11, 2014*

**math-fractions**

Thank you

*February 11, 2014*

**math-fractions**

I have to tell the answer in terms of fractions. My doubt is whether it is 9/12 + 6/12 = 15/12 or 15/24 ?

*February 11, 2014*

**math-fractions**

Each band member had 12 tickets to sell, Jamie sold 9 of his tickets Matt sold 6 of his tickets. Using fractions find the total number of tickets sold by Jamie & Matt

*February 11, 2014*

**soc. stud. --- check my work pls!!!**

Diana is right 100% thanks so much

*February 10, 2014*

**math**

You all are terrible at this and Steve is so wrong like all the time. 3*4*5 = 60

*February 9, 2014*

**Social Studies**

10. Which of the following was Daniel Webster speaking of when he declared, "Liberty and Union, now and forever, on and inseparable!"? A) regional differences*** B) international differences C) improved transportation D) improved industry Is my answer correct?

*February 8, 2014*

**Science**

yeah

*February 8, 2014*

**Social Studies**

THANK YOU SO MUCH! THIS HELPS!

*February 8, 2014*

**Social Studies**

What did the Monroe Doctrine hope to accomplish?

*February 8, 2014*

**Social Studies**

Oh.. umm thanks

*February 7, 2014*

**Social Studies**

Is my answer correct?

*February 7, 2014*

**Social Studies**

During the early 1800s, the United States tried to make peace with other countries in order to grow and develop. Give an example of one of these peace efforts and briefly explain what it hoped to accomplish. An example of one of the peace efforts was the Missouri Compromise. ...

*February 7, 2014*

**ap chemistry**

5.63

*February 4, 2014*